I am having a hard time with that one. About to fall out of my chair.

You don't want your PH to go quite that low but sometimes it does for a short time untill you bring it back up. If you want to know do it. Take a cube and soak it in low PH water and see what happens. Take a small piece and put in lemon juice or some acid. I don't think it will and by the time it did your plant would be in the history books.